BMW 335i water pump failure issue addressed after battery replacement on BMW 335i

Some BMW 335i owners report experiencing water pump failure issues after a battery replacement, often characterized by the pump running at full speed and drawing excess amperage, which can quickly drain the battery. Many owners emphasize the importance of checking all electrical connections to ensure they are secure, as loose connections can lead to malfunctions. Additionally, if the negative battery terminal was not disconnected during the water pump replacement, it may result in a blown fuse (F07) that supplies power to the pump. Some owners find that if the new water pump does not run during the bleeding process, it could indicate a problem with the pump or its electrical connections. In certain cases, replacing both the water pump and thermostat together has resolved issues related to excessive pump operation and battery drainage after engine shutdown. If problems persist, it is advisable for owners to seek assistance from a dealer or qualified mechanic for further diagnosis.